Method of and apparatus for producing stove-duffs



(No M0001.) *Y v2 sneetsf-'snet 1.v J. F. BSSLER 8; H, K. BERKIEHEIMER.v METHOD OP AND APPARATUS FOR PRODUGING STOVE DUPFS.

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J. F. ESSLB'R 8v H..K. BERKHEIMER. METHOD 0F AND APPARATUS FOR PRoDUcINe sToVEV DUFFS.

No. 508,002. Patented Novr', 1893.

UNITED STATES PATE-NT x OFFICE. f

JOI-IN F. ESSLER AND HENRY K. BERKHEIMER, OFMINNEAPOLIS, MINNESOTA,

METHOD OF AND APPARATUS FOR PRODUCING STOVE-DUFFS.

SPECIFICATION forming part of Letters l:Patent No. 508,002, dated November 7, 1893.

Application tiled March 28,1892. Serial No. 426.743. (No model.)

To all whom it may concern:

Be it known that we, JOHN F. EssLER and HENRY K. BEEKHEIMER, citizens of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented. certain new and useful Improvements in Methods of and Apparatus for Producing Stove-Duffs; and wedo hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. Our 'invention relates to what is known in the trade as cast metal duffs; and has for its object to cheaply produce such Vduffs with uniform flanges or dove-tail surfaces.

To this end four invention consists in the novel method of producing the said duffs and a special form of molding device for applying or carrying out the said method; which process or method and which device or apparatus will be hereinafter fully described and be particularly defined in the claims.

Our invention was especially designed for use in the production of stove duffs, or stove leg sockets; and will be herein illustrated and described, as applied for that purpose. It will be understood, however, that the invention might equally well be used for the production of dus or dove-tail iianges of uniform iiare on any other desired article.

InA stoves, it is desirable to have the duffs or leg sockets of exactly uniform iiare, so that they will accurately fit the shank of the stove leg. Otherwise it is' difficult to properly secure the leg to the stove and the setting of the stove will be unstable. 'It is also desirable and even necessary to meet the competition in the trade, that the stove castings, including the duffs or leg sockets should be made very cheaply. These ends we accomplish by our invention.

Figures l and 2 are, respectively, an end elevation and plan view of the original male chill. -Figs. 3, 4 and 5, are respectively, an end elevation, a transverse section, and a bottom view of the original female form. Figs. 6 to 18, inclusive, and' Figs. 20, 21 and 22, are views partly in end elevation and partly in transverse section, illustrating various steps in the process. Fig. 19 isa plan view of a face-plate used in forming the guide-lugs.

Figs. 23Vand 24 are respectively, a transverse section and a bottom view of a portion of the pattern provided with the guide-lugs. Fig. 25 is a view in transverse section, showing the pattern, together with a pair of iinal female chills positioned thereon, embedded in the sand. Fig. 26 is a similar view to Fig. 25, showing the chills in position, and the impression left in the sand by the withdrawal of the pattern.V Figs. 27 and 28 are respectively, views in sectional elevation and plan, showing the product of the process, or a portion of the stove base with the dufts `cast thereon.

Inasmuch as the different figures of the drawings are designed chiefly to illustrate the different steps of the process; the detailed description will be carried concurrently with the designation of the figures. The preferred or complete process for producing the best or most accurate form of duff will be first described; and thereafter, the dispensable steps will be noted, thereby disclosing the basis for the broad or generic claims. First. We start by making, from metal, either by hand orby machinery, what we call our original male form A. This form is illustrated in end elevation and plan respectively in Figs. l and 2. It comprises the part a with a iange of the exact desired shape and a base a which is of such shape as to permit the form to be withdrawn from the sand without disturbing the impression left by the part a or flange proper. Second. We next make, by hand or machinery, what we call our rough or wooden female form B, which is made to fit freely over 'the male form'vA, and with its exterior shaped'for reverse draft.- This wooden form is shown in end elevation, cross section and plan respectively, in Figs. 3, 4 and 5. Third. These two originals A and B are then fitted together and embedded in the sand asshown in Fig. 6, and the wooden member is withdrawn, leaving the male member embedded as a chill. Fourth. From this male member A as a chill and the impressionleft in the sand bythe wooden member, as showin in Fig-7, we cast a female chill B2 which is illustrated in Fig. 8. This female chill B2 will have its interior of a shape corresponding exactly to the exterior of the iange part a of the origi- IOO chill and leaving said female chill embedded in the sand as shown in Fig. 10, we cast therefrom and the impression left in the sand, two

male forms A2, shown in Fig. 11, which for dis tinction we may call shrunk male chills or forms. Sixth. We cutaway the dove-tailbevel from one of the shrunk male forms or chills, taking great care to leave the base of the duif flange intact, producing what we call the male guide lug chill C which is shown in Fig. l2. Seventh. We next use the shrunk male chill or formA A2 and the female form or chill B2, embedding the same, together in the sand,as shown in Fig. 13. Then after withdrawing the female chill B2, we cast from the embedded male chill A2- and the impression left in the sand (as shown in Fig. 14), what we call, the final female chill, shown in Fig. 15. A large number of these final female chills B2 may be cast, and kept in stock, for use in connection with patterns which have been fitted for co-operation with the same. Eighth. We next use the dressed or guide lug chill C" in cooperation with the female form or chill B2, embedding the same, together in the sand,as shown in Fig. 1G, and then, after Withdraw ing the female chill B2 from the sand, we cast from the impression thus left in the sand and the embedded dressed or male guide-lug chill C (as shown in Fig. 17), what we call the female guide lug chill D', which is shown in Fig. 1S. Ninth. We next use the female guide lug chill D in co-operation with the face plate E, shown in Figs. 19 and 20, having pin seats e, and in co-operation with rivet pins e inserted into the said seats, to produce the guide lugs C2, as shown in Figs. 20, 21 and 22. A large number of these guide lugs C2 each having the rivet studs, as shown in Fig. 22, are thus cast and kept in stock.

Tenth. We next rivet the guide lugs C2 to the pattern F, of the stove plate or other de sired article, in the proper positions, in pairs, if making stove duffs, as shown in Figs. 23, and 24. Eleventh. The final female chills B3,

together with the pattern F with the guide lugs secured thereto, are embedded together in the sand, as shown in Fig. 25, the female chills B3 being used in pairs, and the guide lug C2 on the pat-tern F serving to accurately position the chills B3. The pattern F together with the guide lugs is then withdrawn, leaving in the sand the chills B3 and the impression of the pattern, as shown in Fig. 26.`

Twelfth. The stove-plate H, or other article, with the duff K or leg socket is then directlycast therefrom. The said final plate or casting being shown in cross section and bottom plan in Figs. 27 and 28 of the drawings. It is evident that when the duff is produced in this way, the flanges of the same will be i an exact `reproduction of the flange on the shrunk male form A2; and that both flanges of the duif and all flanges used on the pattern will be of exactly the same flare. Hence, if the stove leg Shanks be made uniform, they will fit any duff or leg socket of the stove. The same pattern with the guide lugs and the same female chills B3 may, of course, be used over and over again indefinitely. The female Achills B3 might also be used on any other pattern, provided a uniform duif flange was adopted or desired on other designs of stoves. For new designs or other patterns, new guide lugs, would, of course, have to be made, as. the rivet studs are only capable of use on one pattern.

The steps above described insure absolutely accurate results, inasmuch as the final female chill B2 and the guide lug C2 have been produced from `corresponding forms, and are of the same shrinkage. In case it is not thought worth while to attempt such great accuracy, several of the steps above specified may be dispensed with. Very good duits, such as would probably answer most practical purposes may be produced by employing only a part of the above specified steps of the process. For example, the wooden form B might be dispensed with and the outside shape or draft lines for the female chill B2 be set in the sand by hand. The exterior form of the chill B2 does not need to be particularly exact, the only important point being that its draft lines should be of such slope as is necessary for its proper withdrawal 'from the sand. Again, the female chill B2 might be treated as the final chill, and the intermediate steps from the fifth to the tenth be omitted. In other words, the female chills B2 might be made in sufficient number and be themselves used in connection with the pattern to produce the casting with the desired du flanges, care being taken, in any suitable way to properly position the chills B2 on or with the pattern in the sand, in such a way that they will preserve their location when the pattern is withdrawn. Again, the forms A2 and the guide lug form or chill C might be made by hand or machinery and treated as the originals, from which to produce the desired female chills for the duff flanges and the desired female chills from which to produce the guide lugs C2. Again, instead of using the female chill B2 with the male guide lug C to produce the female guide lug D', the exterior form of the said female guide lng D might `be made in the sand by hand.

The process herein described though seeming tedious in description, is very speedily applied in practice, enabling thc plates with the desired dui's or leg sockets to be produced Very cheaply.

The use of the independent female chills in connection with the pattern having suitable guide lugs for positioning the chills in the sand, as shown in Fig. 25 is a great con- 'loo IIO

venience over any plan hitherto applied so far as we are aware onY account of `the .fact that they may be readily withdrawn from the du flanges on the plate, regardless of their position. It is not absolutely necessary that the guide-lugs should be of the exact form shown in the said Fig. 25. Supposing said independent female chills to havebeen accurately made, any kind of guide-lugs might be employed on the pattern which would result in accurately positioning the said chills in the sand. It will of course be understood that when the dus are formed byourinvention as described, that no vfilingor dressing of the duff iianges is'required.

What we claim, and desire to secure by Letters Patent, is-

1. The method of producing cast metal duffs whichconsists inz-making an original male form or chill of the desired shape of duff flange and an original female form freely tting over said male form and having its exterior shaped for reverse draft; embedding the two originals, when fitted together, in the sand and withdrawing the female member; casting from Said embedded male form and the impression left by the female form, a number of female forms or chills; embedding the cast female chills in y pairs properly positioned, with .the pattern of the desired article in the sand and withdrawing the pattern; and linally casting the desired article from the embedded female chills and the impression left by the pattern. A

' 2. Molding devices, for producing cast metal dus, comprising an original male form having the shape of the desired duff ange and secured on a base having its exterior shaped for draft in the same direction; and a female original form'itting over the said male 'form and having its exterior formed for draft in the reverse direction, whereby female chills may be produced having interiors of the exact form of the male original, and exteriors of the eX- act form as the exterior of the female originaLadapted for use in connection with the pattern of the article to cast the plates with duff anges, substantially as described. f

Intestimony whereof we ax our signatures in presence of two witnesses.

JoHN F. EssLRR. HENRY K. BHRKHEIMER.

Witnesses:

JAS. F. WILLIAMSON, FRANK D. MERCHANT. 

